Internal-combustion-engine cylinder



G. E. BRADSHAW.

INTERNAL COMBUSTION ENGINE CYLINDER.

APPLICATION FILED AUG-20, 1920.

1 71,732. Patented Mar. 15, 1921.

UNlTED STATES PATENT OFFICE.

GRANVILLE EASTWOOD BRADSHAW, OF HERSHAM, WALTON-ON-THAMES, ENGLAND,ASSIGNOR TO A. B. C. MOTORS (1920) LIMITED, OF HERSHAM,WALTON-ON-THAMES,

ENGLAND.

INTERNAL-COMBUSTION-ENGINE CYLINDER.

Specification of Letters Patent.

Application filed August 20, 1920. Serial No. 404,916.

BRADSHAW, a subject of the King of Great Britain and Ireland. residingat A. B. C.

Motor \Vorks, Hersham, VValton-on-Thames, in the county of Surrey,England. have invented new and useful Improvements in InternalCombustion Engine Cylinders. ot' which the following is a specification.

This invention relates to improvements in internal combustion enginecylinders which have for their main object to maintain an eventemperature over that part of the cylinder barrel or cylinder proper inwhich the working stroke of the piston occurs, inequalities oftemperature tending to distort the cylinder and cause leakage'past thepiston. Other subsidiary objects or advantages secured by the inventionare general reduction of the temperature of the cylinder proper and ofthe weight of the complete cylinder. low cost in manufacture and absence of joints or sleeves through which heat has to be radiatedoutward. such as for instance, in the case of a cast-iron or steel linerpressed into an aluminium or copper shell. According to the invention asleeve or ring of material having good heat conductivity such asaluminium or copper is interposed between the cylinder head and thecylinder proper. The cylinder head may be of cast-iron and as thismaterial is of poor heat conductivity, is liable to remain hot near theexhaust valve and cool near the inlet valve. Before reaching thecylinder barrel, however. the heat passes through the aluminium orcopper sleeve. in which it is distributed more evenly owing to its goodconducting power, and thus the temperature of the cylinder barrel ismaintained more uniform than heretofore. v

Further details of the invention will be described more fully withreference to the accompanying drawings in whichsleeve or ring.

Referring to Fig. 1 of the drawings, the cylinder head 1 may be made ofcast iron and have integrally formed with it the inlet and exhaust valveseats and parts and other usualfittings, or be made of aluminium withsuitable valve seats inserted in known manner. In either case it ispreferably provided with ribs 2 to assist cooling. The cylinder barrelor cylinder proper 3. within which the piston 4 works may be made ofsteel or other suitable material and as shown does Patented Mar. 15,1921.

not extend appreciably above the top of the piston when this is at thetop of thestroke.

It is as usual provided with ribs 5 for cooling purposes.

Between the cylinder head 1 and the barrel 3 is provided a sleeve orring 6 made of material of good heat conductivity, preferably copper oraluminium, and this may have fins such as 7 to assist in dissipatingheat. The sleeve or ring may be spigoted as shown at 8 and 9respectively into the cylinder barrel and cylinder head (or vice versa)and the parts may be bolted together or fixed in any known manner totake the stress due to the explosion.

In Fig. 2, the member 6 is shown as a thin rin'g between thecylinderhead 1 and the cylinder barrel 3, jointing rings or washers 10 beingused to insure a pressure-tight joint.

It is obvious, of course. that many modifications may be made in thedetails of the invention.

I claim 1. A cylinder for internal combustion engines comprising anintegral cast metal barrel, a cast metal head having intake and exhaustvalves mounted therein. and a sleeve between said barrel and head. saidsleeve being of metal of a higher conductivity than said barrel andhead.

i 2. In an internal combustion engine cylinder, an integral cast metalbarrel terminating slightly above the uppermost position of the piston.a sleeve seated on. said barrel above the piston and formed of metalhaving a higher conductivity than said barrel. and a cast metal headseated on said sleeve. said head having intake and exhaust valvesmounted therein.

GRANVILLE EASTWOOD BRADSHAW.

